Definition of optional adjective from the Oxford Advanced Learner's Dictionary

  

optional

 adjective
adjective
BrE BrE//ˈɒpʃənl//
 
; NAmE NAmE//ˈɑːpʃənl//
 
Subjects and courses
 
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that you can choose to do or have if you want to Certain courses are compulsory; others are optional. This model comes with a number of optional extras (= things you can choose to have but which you will have to pay extra for). See related entries: Subjects and coursesExtra examples Certain classes are compulsory, others are optional. These features can be offered as an optional part of the package. This model comes with a number of optional extras.
See the Oxford Advanced American Dictionary entry: optional